Farscape would like you to use "Frell" instead of "Fu*k". If that catches on...
Nah, 'Frell!' doesn't have the same shock impact as "F**k!"
I usually replace:
f**k - fudge, frick, freak, phoque (as in seal in French), frig, ffffff!, figs
shit - shite, shitzu, shot, shhhh!, shick
crap - crud, craptastic!, craparoni, crapper, creep
damn - d'oh!, dang, darn, durn, damnation, ding dang doodly
hell - hell
"So, we can swear now? Hell damn fart!"
(Bart Simpson)